Hoisting — Drum Rope Capacity
Drum Rope Capacity calculation for hoisting and winching work.
The drum formula assumes neat, tight winding — real spooling under light load achieves 90% of it on a good day. Keep the last-layer rule in view: rope should never wind closer than two rope diameters from the flange top, or it climbs over and destroys itself in a wrap.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Drum Rope Capacity calculation for hoisting and winching work. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Hoisting — Drum Rope Capacity
Hoisting — Drum Rope Capacity computes the governing relationship L = A(A+B)C·K / d² [classic drum capacity, K≈0.785 metric] live as you type. The drum formula assumes neat, tight winding — real spooling under light load achieves 90% of it on a good day. Keep the last-layer rule in view: rope should never wind closer than two rope diameters from the flange top, or it climbs over and destroys itself in a wrap. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Hoisting — Drum Rope Capacity
- 1Enter your values — Drum flange depth A, Drum barrel diameter B, Drum width C, Rope diameter (sensible defaults are pre-filled).
- 2Read the live results: Rope capacity.
- 3Check the "with your numbers" line to see L = A(A+B)C·K / d² [classic drum capacity, K≈0.785 metric] substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Hoisting — Drum Rope Capacity?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula L = A(A+B)C·K / d² [classic drum capacity, K≈0.785 metric] with authoritative sources cited on the page (Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices)
- ✓The drum formula assumes neat, tight winding — real spooling under light load achieves 90% of it on a good day.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the hoisting — drum rope capacity use?+
It evaluates L = A(A+B)C·K / d² [classic drum capacity, K≈0.785 metric], exactly as published. Sources: Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
The drum formula assumes neat, tight winding — real spooling under light load achieves 90% of it on a good day. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Drum Rope Capacity calculation for hoisting and winching work. A free crane load, wind & rigging safety tool. Keep the last-layer rule in view: rope should never wind closer than two rope diameters from the flange top, or it climbs over and destroys itself in a wrap. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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